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time.h revision 1.2.6.2 
      1 /*	$NetBSD: time.h,v 1.2.6.2 2014/05/22 11:40:56 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_TIME_H_
     33 #define _LINUX_TIME_H_
     34 
     35 #include <sys/time.h>
     36 
     37 /*
     38  * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to
     39  * happen on 32-bit systems because it returns unsigned long.  Some
     40  * callers in Linux (implicitly) convert the result to time_t, though.
     41  * We'll pretend get_seconds returns time_t and make sure all our
     42  * callers treat it as if it did.
     43  */
     44 
     45 static inline time_t
     46 get_seconds(void)
     47 {
     48 	return time_second;
     49 }
     50 
     51 static inline void
     52 getrawmonotonic(struct timespec *ts)
     53 {
     54 	getnanouptime(ts);
     55 }
     56 
     57 static inline bool
     58 timespec_valid(const struct timespec *ts)
     59 {
     60 	if (ts->tv_sec < 0)
     61 		return false;
     62 	if (1000000000L <= ts->tv_nsec)
     63 		return false;
     64 	return true;
     65 }
     66 
     67 static inline struct timespec
     68 ns_to_timespec(const int64_t nsec)
     69 {
     70 	struct timespec ts;
     71 
     72 	ts.tv_sec = (nsec / 1000000000L);
     73 	ts.tv_nsec = (nsec % 1000000000L);
     74 	if (ts.tv_nsec < 0) {
     75 		ts.tv_sec -= 1;
     76 		ts.tv_nsec += 1000000000L;
     77 	}
     78 
     79 	return ts;
     80 }
     81 
     82 static inline int64_t
     83 timespec_to_ns(const struct timespec *ts)
     84 {
     85 	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
     86 }
     87 
     88 static inline struct timespec
     89 timespec_sub(struct timespec a, struct timespec b)
     90 {
     91 	struct timespec d;
     92 
     93 	timespecsub(&a, &b, &d);
     94 
     95 	return d;
     96 }
     97 
     98 static inline void
     99 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
    100 {
    101 	while (nsec >= 1000000000L) {
    102 		nsec -= 1000000000L;
    103 		sec += 1;
    104 	}
    105 	while (nsec < 0) {
    106 		nsec += 1000000000L;
    107 		sec -= 1;
    108 	}
    109 	ts->tv_sec = sec;
    110 	ts->tv_nsec = nsec;
    111 }
    112 
    113 #endif  /* _LINUX_TIME_H_ */
    114